#include<bits/stdc++.h>
using namespace std;
int main()
{
	int i,n,salary;
	double k,price=200;
	cin>>n>>k;
	if(n>=price)
	{
		cout<<"1";
		return 0;
	}
	for(i=2;i<=20;i++)
	{
		salary=i*n;
		price=price*(1+k/100);
		if(salary>=price)
		{
			cout<<i;
			return 0;
		}
	}
	cout<<"Impossible";
    return 0;
}

